Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A8E4E9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N672UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8E4E9
Octal
52162351
Decimal
11,068,649
Country
US
Tail
N672UA
Type
B763
No current signal · last broadcast 13h ago
Flights observed
159
Distinct callsigns
20
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S A8E4E9.

Country allocation

The ICAO 24-bit address A8E4E9 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
UAL959 United Airlines 15 2026-06-03
UAL273 United Airlines 14 2026-05-16
UAL134 United Airlines 13 2026-06-01
UAL956 United Airlines 10 2026-05-12
UAL272 United Airlines 9 2026-05-16
UAL135 United Airlines 9 2026-05-24
UAL957 United Airlines 8 2026-05-13
UAL940 United Airlines 8 2026-05-30
UAL920 United Airlines 8 2026-06-05
UAL12 United Airlines 7 2026-06-02
UAL15 United Airlines 6 2026-05-31
UAL147 United Airlines 5 2026-06-05
UAL966 United Airlines 4 2026-05-29
UAL929 United Airlines 4 2026-06-02
UAL928 United Airlines 4 2026-04-26
UAL938 United Airlines 3 2026-05-31
UAL909 United Airlines 3 2026-04-18
UAL908 United Airlines 3 2026-04-18
UAL967 United Airlines 2 2026-05-29
UAL941 United Airlines 2 2026-05-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL4199 MDE → EWR Jul 13, 15:13 UTCJul 13, 20:05 UTC4h 52m
2026-07-13 UAL4199 MDE → EWR Jul 13, 15:13 UTCJul 13, 19:59 UTC4h 46m
2026-07-10 UAL4201 - Jul 10, 16:50 UTCJul 10, 17:00 UTC10m
2026-06-07 UAL4196 LCQ → ORD Jun 7, 14:05 UTCJun 7, 16:35 UTC2h 30m
2026-06-05 UAL147 LHR → EWR Jun 5, 11:15 UTCJun 5, 18:45 UTC7h 30m
2026-06-05 UAL920 ORD → LHR Jun 5, 00:07 UTCJun 5, 07:17 UTC7h 10m
2026-06-05 UAL920 ORD → LHR Jun 5, 00:00 UTCJun 5, 07:20 UTC7h 20m
2026-06-03 UAL959 LHR → ORD Jun 3, 10:30 UTCJun 3, 11:30 UTC1h 0m
2026-06-03 UAL959 LHR → ORD Jun 3, 10:30 UTCJun 3, 18:40 UTC8h 10m
2026-06-03 UAL959 LHR → ORD Jun 3, 10:30 UTCJun 3, 18:22 UTC7h 52m
2026-06-02 UAL929 ORD → LHR Jun 2, 22:35 UTCJun 3, 06:05 UTC7h 30m
2026-06-02 UAL12 HNL → LAX Jun 2, 08:20 UTCJun 2, 16:45 UTC8h 25m
2026-06-01 UAL134 EWR → ZRH Jun 1, 22:39 UTCJun 2, 05:16 UTC6h 37m
2026-06-01 UAL134 EWR → ZRH Jun 1, 22:20 UTCJun 2, 04:15 UTC5h 55m
2026-05-31 UAL15 LHR → EWR May 31, 15:00 UTCMay 31, 16:15 UTC1h 15m
2026-05-31 UAL15 LHR → EWR May 31, 14:44 UTCMay 31, 22:12 UTC7h 28m
2026-05-31 UAL938 ORD → LHR May 31, 09:40 UTCMay 31, 11:00 UTC1h 20m
2026-05-31 UAL938 ORD → LHR May 31, 03:33 UTCMay 31, 10:52 UTC7h 19m
2026-05-30 UAL959 LHR → ORD May 30, 19:00 UTCMay 30, 21:40 UTC2h 40m
2026-05-30 UAL959 LHR → ORD May 30, 18:55 UTCMay 30, 21:21 UTC2h 26m
2026-05-30 UAL959 LHR → ORD May 30, 11:25 UTCMay 30, 17:20 UTC5h 55m
2026-05-30 UAL940 EWR → LHR May 30, 01:25 UTCMay 30, 08:15 UTC6h 50m
2026-05-29 UAL967 NAP → EWR May 29, 12:35 UTCMay 29, 21:40 UTC9h 5m
2026-05-29 UAL966 EWR → NAP May 29, 01:11 UTCMay 29, 09:29 UTC8h 18m
2026-05-29 UAL966 EWR → NAP May 29, 01:05 UTCMay 29, 09:20 UTC8h 15m
2026-05-28 UAL967 NAP → EWR May 28, 12:40 UTCMay 28, 21:30 UTC8h 50m
2026-05-28 UAL966 EWR → NAP May 28, 01:26 UTCMay 28, 09:44 UTC8h 18m
2026-05-28 UAL966 EWR → NAP May 28, 01:20 UTCMay 28, 09:35 UTC8h 15m
2026-05-27 UAL15 LHR → EWR May 27, 14:44 UTCMay 27, 22:06 UTC7h 22m
2026-05-27 UAL15 LHR → EWR May 27, 14:44 UTCMay 27, 22:04 UTC7h 20m
2026-05-26 UAL929 ORD → LHR May 26, 22:03 UTCMay 27, 05:29 UTC7h 26m
2026-05-26 UAL929 ORD → LHR May 26, 21:59 UTCMay 27, 00:14 UTC2h 15m
2026-05-26 UAL12 HNL → LAX May 26, 08:14 UTCMay 26, 17:23 UTC9h 9m
2026-05-26 UAL12 HNL → LAX May 26, 07:59 UTCMay 26, 08:15 UTC15m
2026-05-25 UAL134 EWR → ZRH May 25, 22:39 UTCMay 26, 05:52 UTC7h 13m
2026-05-25 UAL134 EWR → ZRH May 25, 22:40 UTCMay 26, 05:54 UTC7h 15m
2026-05-25 UAL31 MUC → EWR May 25, 07:55 UTCMay 25, 16:20 UTC8h 25m
2026-05-24 UAL30 EWR → MUC May 24, 21:30 UTCMay 25, 04:55 UTC7h 25m
2026-05-24 UAL135 ZRH → EWR May 24, 08:40 UTCMay 24, 16:55 UTC8h 15m
2026-05-23 UAL134 EWR → ZRH May 23, 22:39 UTCMay 24, 05:52 UTC7h 13m
2026-05-23 UAL134 EWR → ZRH May 23, 22:45 UTCMay 24, 00:15 UTC1h 30m
2026-05-23 UAL17 LHR → EWR May 23, 10:00 UTCMay 23, 17:40 UTC7h 40m
2026-05-23 UAL920 ORD → LHR May 23, 00:00 UTCMay 23, 07:25 UTC7h 24m
2026-05-22 UAL12 HNL → LAX May 22, 09:49 UTCMay 22, 18:47 UTC8h 58m
2026-05-22 UAL12 HNL → LAX May 22, 10:00 UTCMay 22, 19:00 UTC9h 0m
2026-05-21 UAL3 LAX → HNL May 21, 21:20 UTCMay 22, 05:00 UTC7h 40m
2026-05-21 UAL12 HNL → LAX May 21, 08:15 UTCMay 21, 17:20 UTC9h 5m
2026-05-21 UAL12 HNL → LAX May 21, 08:05 UTCMay 21, 08:10 UTC5m
2026-05-20 UAL3 LAX → HNL May 20, 22:15 UTCMay 21, 05:50 UTC7h 35m
2026-05-20 UAL959 LHR → ORD May 20, 18:40 UTCMay 20, 18:50 UTC10m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N672UA page for operator, model, and routing details .

Mode-S A8E4E9 frequently asked

What is Mode-S code A8E4E9?
A8E4E9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N672UA.
Where is Mode-S A8E4E9 registered?
Mode-S code A8E4E9 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A8E4E9 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8E4E9, octal 52162351, decimal 11,068,649.
What flights does A8E4E9 operate?
Mode-S A8E4E9 has broadcast 20 distinct callsigns, including UAL959, UAL273, UAL134, UAL956, UAL272.